Sulfur-Modified Graphitic Carbon Nitride Nanostructures as an Efficient Electrocatalyst for Water Oxidation

Vinayak S. Kale, Uk Sim, Jiwoong Yang, Kyoungsuk Jin, Sue In Chae, Woo Je Chang, Arun Kumar Sinha, Heonjin Ha, Chan Cuk Hwang, Junghyun An, Hyo Ki Hong, Zonghoon Lee, Ki Tae Nam, Taeghwan Hyeon

Research output: Contribution to journalArticlepeer-review

33 Citations (Scopus)

Abstract

There is an urgent need to develop metal-free, low cost, durable, and highly efficient catalysts for industrially important oxygen evolution reactions. Inspired by natural geodes, unique melamine nanogeodes are successfully synthesized using hydrothermal process. Sulfur-modified graphitic carbon nitride (S-modified g-CN x) electrocatalysts are obtained by annealing these melamine nanogeodes in situ with sulfur. The sulfur modification in the g-CN x structure leads to excellent oxygen evolution reaction activity by lowering the overpotential. Compared with the previously reported nonmetallic systems and well-established metallic catalysts, the S-modified g-CN x nanostructures show superior performance, requiring a lower overpotential (290 mV) to achieve a current density of 10 mA cm−2 and a Tafel slope of 120 mV dec−1 with long-term durability of 91.2% retention for 18 h. These inexpensive, environmentally friendly, and easy-to-synthesize catalysts with extraordinary performance will have a high impact in the field of oxygen evolution reaction electrocatalysis.

Original languageEnglish
Article number1603893
JournalSmall
Volume13
Issue number17
DOIs
Publication statusPublished - 2017 May 3
Externally publishedYes

Keywords

  • electrocatalysis
  • graphitic carbon nitride
  • nanostructures
  • oxygen evolution reaction

ASJC Scopus subject areas

  • Biotechnology
  • Biomaterials
  • Chemistry(all)
  • Materials Science(all)

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